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Leases - Narrative (Details)	9 Months Ended
	Sep. 30, 2021 lease
Leases [Abstract]
Number of finance leases	5

X

- Definition

Finance Lease, Number Of Leases

+ References

No definition available.

+ Details

Name:	mac_FinanceLeaseNumberOfLeases
Namespace Prefix:	mac_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration